configure.py: switch cmake to build c-ares to do out-of-source-tree build
configure.py: switch cmake to build c-ares to do out-of-source-tree build

Debian packaging system doesn't accept modification in source tree while
building, but c-ares does it to generate ./configure script.
Because of this, Scylla .deb package build fails.
To avoid the problem, switch to cmake instead of ./configure && make.

See scylladb/scylla#2085

Signed-off-by: Takuya ASADA <4ebfb6f510af412d6e89fefa3ab96d9c8b5e3fff@scylladb.com>
Message-Id: <1487264013-15359-1-git-send-email-4ebfb6f510af412d6e89fefa3ab96d9c8b5e3fff@scylladb.com>

syuu1228/seastar,cloudius-systems/seastar,avikivity/seastar,dreamsxin/seastar,syuu1228/seastar,avikivity/seastar,dreamsxin/seastar,dreamsxin/seastar,avikivity/seastar,scylladb/seastar,scylladb/seastar,cloudius-systems/seastar,scylladb/seastar,cloudius-systems/seastar,syuu1228/seastar